According to this info, Android’s going to get the ball rolling this Friday, with the app becoming available at 7AM Eastern. Supposedly, the iOS version of BBM would then follow suit, showing up overnight as we move into Saturday.

After all the hype, with BBM developing this reputation as the great messaging service that most of us just didn’t have access to, expectations are going to be appropriately high. Will Android and iOS users be suitably impressed, or are we just going to get a lot of “thanks, but we already have WhatsApp” reactions? If this news is on the money, we may begin to get a sense of the reactions by sometime next week.

Update: Blackberry has just made the news official, though the timing is slightly off from the rumor: the Android port arrives this Saturday, September 21, while the iOS version comes on Sunday.